support webpackMode and other inline magic comments

[ahabhgk]

What problem does this feature solve?

• webpack-test/cases/chunks/inline-options

What does the proposed API of configuration look like?

import(/* webpackMode: "lazy" */ "./dir4/" + name);

[WbaN314]

Any timeline when this will be implemented?

[ahabhgk]

webpackMode: "lazy" is on the plan, will likely be implemented in this or next month, other inline magic comments don't have a clearly timeline